"I've made lots of investigation last year on Tesla turbine design. The problem is an absence of scientific study on component placement (layer thickness, cross-layer gap, hole distance etc.). If brushless motors are known to reach 96%…"
John Rambo's Discussions
a nice twincopter contept...
Started this discussion. Last reply by Dan "HotSeat" Neault Mar 23, 2012. 1 Reply 0 Likes
...and even more nice tiny ramjet conteptrecently fount http://www.conceptruin.com/thought will share this beautiful video with you…Continue
electromechanical holder/braker
Started Oct 21, 2011 0 Replies 0 Likes
Gentlemen, I wonder what kind of addons you use to perform passive hold of position for UAV tails, robotic arms, domed cameras etc? Stepper motors must always be powered otherwise they'll loose 99%…Continue
John Rambo's Page
Latest Activity
John Rambo commented on John Edmonds's blog post APM 2.x Power management and Distribution system"some questions:
atmega2560 costs 5x the 328P, so wouldn't it make more sense to use 328P + 4051 or 4067 MUX for voltage/current sensing? Or is it the same uC to be used, not the separate-one?
uC controlled battery switch, where the same uC is…"
John Rambo commented on Nick Arsov's blog post Using Smart High-Side Power Switches as a battery switch + current sensor + protection"for $7 that's a fine device.
I've been looking for this kind of function for two weeks and ended up with ACS712 for the current sensing together with MTP3055VL MOSFETS for a 5V controlled switching. Full circuit came to cost just above $6…"
John Rambo commented on Nick Arsov's blog post Using Smart High-Side Power Switches as a battery switch + current sensor + protection"$20 for BTS555 price at farnell? A good latching relay costs $10, or, alternatively - one could get a a handful of premium logic level MOSFETS.
How is this-one better?"
John Rambo commented on Ellison Chan's blog post Iran Cracks RQ-170 Stealth Drone Code."hey wait a minute, I thought drones are streaming upstairs? Plus, since its a satellite uplink, it can't be analogue data stream, can it? Then, it gets a bit tricky for Iranians to capture such kind of data, unless their flying carpets are…"
John Rambo commented on Ellison Chan's blog post Iran Cracks RQ-170 Stealth Drone Code."one thing is to capture drone with a fake GPS signal, another is to disassemble military-encrypted code. Once they'll get that thing into the air, I'll have my thumb up (for Russians of course - they helped then, they might help now)"
Dan "HotSeat" Neault replied to John Rambo's discussion a nice twincopter contept..."dude, I have the same thing in my basement, just not as pretty,
Worked great untill I was screwing with the older DCM code and had an incident :)
Just waiting for some HK stuff before she files again, modding the mission planner for…"
John Rambo posted a discussiona nice twincopter contept...
...and even more nice tiny ramjet conteptrecently fount http://www.conceptruin.com/thought will share this beautiful video with youRUIN from OddBall Animation on Vimeo.See More
John Rambo commented on federico lolli's blog post New Low Cost AHRS Sensor Board"price is reasonable, but 400MHz? Isn't it a bit of an overkill? Or are you kalman-filtering?"
John Rambo commented on Andrew Rabbitt's blog post Keeping APM Operational at 120000 feet - a first look"Andrew, if you're up to catch a JetStream, why are you aiming for 120k feet, instead of 50k? I did also a check on your link on x-plane simulation, but missed the pressure data on the screen - you should double check there's a standard ISA…"
John Rambo commented on Andrew Rabbitt's blog post Keeping APM Operational at 120000 feet - a first look"Temperature is a least thing to worry about (IMHO). At altitude of 36km you'll have pressure of ~500Pa, which is 200 times less than that on then surface of earth. For your plane to fly, it must either have 200 times aerodynamic surface,…"
John Rambo commented on Max Levine's blog post Scientists invent lightest material on Earth. What now?"I would choose aerogel instead due to its strenght capabilities"
John Rambo commented on Paul's blog post BeagleBone offers up ARM A8 processor, Linux and 10-second boot for 89 bones"Great thing for a reasonable price.
I wonder what's the power consumption (idle, avg, max) with no IO devices attached?
What's the exact weight?
ps: just curious, why not Cortex A9?"
John Rambo posted a discussionelectromechanical holder/braker
Gentlemen, I wonder what kind of addons you use to perform passive hold of position for UAV tails, robotic arms, domed cameras etc? Stepper motors must always be powered otherwise they'll loose 99% of the torque they generate, so I presume there should be something similar to electromagnetic clutches / brakes with the only difference - they must be always "on" (with help of some rare-earth magnets or mainsprings), where, in case some trun/move must be done, an extra electromagnetic force is…See More
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